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Backup of some arduino code to handle OV7670
#define SIO_C 2
#define SIO_D 4
#define SIO_CLOCK_DELAY 100
void setup()
{
pinMode(8,OUTPUT);
// while(1)
// {
// digitalWrite(8,HIGH);
// delayMicroseconds(SIO_CLOCK_DELAY);
// digitalWrite(8,LOW);
// delayMicroseconds(SIO_CLOCK_DELAY);
// }
Serial.begin(9600);
Serial.println("Start InitOV7670 test program");
digitalWrite(8,HIGH);delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(8,LOW);delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(8,HIGH);delayMicroseconds(SIO_CLOCK_DELAY);
if(InitOV7670())
Serial.println("InitOV7670 OK");
else
Serial.println("InitOV7670 NG");
}
void loop()
{
}
void InitSCCB(void) //SCCB初期化
{
pinMode(SIO_C,OUTPUT);
pinMode(SIO_D,OUTPUT);
digitalWrite(SIO_C,HIGH);
digitalWrite(SIO_D,HIGH);
Serial.println("InitSCCB - PortDirectionSet & Set High OK");
}
void StartSCCB(void) //SCCBスタート
{
Serial.println("StartSCCB");
digitalWrite(SIO_D,HIGH);
delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(SIO_C,HIGH);
delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(SIO_D,LOW);
delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(SIO_C,LOW);
delayMicroseconds(SIO_CLOCK_DELAY);
}
void StopSCCB(void) //SCCBストップ
{
//Serial.println("StopSCCB");
digitalWrite(SIO_D,LOW);
delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(SIO_C,HIGH);
delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(SIO_D,HIGH);
delayMicroseconds(SIO_CLOCK_DELAY);
}
char SCCBWrite(byte m_data)
{
unsigned char j,tem;
//Serial.print("SCCBWrite 0x");
//Serial.println(m_data,HEX);
//Serial.print("SCCBWrite");
for(j=0;j<8;j++) //循环8次发送数据
{
if((m_data<<j)&0x80)
{
digitalWrite(SIO_D,HIGH);
}
else
{
digitalWrite(SIO_D,LOW);
}
delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(SIO_C,HIGH);
delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(SIO_C,LOW);
delayMicroseconds(SIO_CLOCK_DELAY);
}
//Serial.println("");
//delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(8,LOW); //debug
pinMode(SIO_D,INPUT); //SIO_Dのバスをスレーブ(OV7670)に渡す
digitalWrite(SIO_D,LOW); //プルアップ防止
delayMicroseconds(SIO_CLOCK_DELAY);
digitalWrite(8,HIGH); //debug
digitalWrite(SIO_C,HIGH);
delayMicroseconds(SIO_CLOCK_DELAY);
//Serial.println(" Write done");
digitalWrite(8,LOW); //debug
if(digitalRead(SIO_D)==HIGH)
{
//SIO_D=Hなら失敗
tem=0;
Serial.println("SCCBWrite NG");
}
else
{
//SIO_D=Lなら成功
tem=1;
//Serial.println("SCCBWrite OK");
}
digitalWrite(SIO_C,LOW);
delayMicroseconds(SIO_CLOCK_DELAY);
pinMode(SIO_D,OUTPUT); //SIO_Dのバスをマスター(Arduino)に戻す
//delayMicroseconds(SIO_CLOCK_DELAY);
//digitalWrite(SIO_D,LOW);
//delayMicroseconds(SIO_CLOCK_DELAY);
//pinMode(SIO_C,OUTPUT); //SIO_Cのバスをマスター(Arduino)に戻す
return tem;
}
int InitOV7670(void)
{
char temp;
int i=0;
InitSCCB();
temp=0x80;
if(WriteOV7670(0x12, temp)==0) //Reset SCCB
{
Serial.println("Resetting SCCB NG");
return 0 ;
}
//Serial.println("Resetting SCCB OK");
//delayMicroseconds(10);
// for(i=0;i<CHANGE_REG_NUM;i++)
// {
// if( 0==wrOV7670Reg(pgm_read_byte( &change_reg[i][0]),pgm_read_byte( &change_reg[i][1]) ))
// {
// return 0;
// }
// }
return 0x01; //ok
}
////////////////////////////
//機能:OV7660レジスタに書き込む
//返値:成功=1 失敗=0
int WriteOV7670(char regID, char regDat)
{
StartSCCB();
if(SCCBWrite(0x42)==0)
{
Serial.println(" Write Error 0x42");
StopSCCB();
return(0);
}
delayMicroseconds(SIO_CLOCK_DELAY);
if(SCCBWrite(regID)==0)
{
StopSCCB();
return(0);
}
delayMicroseconds(SIO_CLOCK_DELAY);
if(SCCBWrite(regDat)==0)
{
StopSCCB();
return(0);
}
StopSCCB();
return(1);
}
@zvika

Hi! did you manage to activate the OV7670 from an Arduino? I am looking for a way to get pictures onto an SD card. Thanks!

@ishawn

So could you tell me how to connect 0v7670 to Arduino Uno?

@relic1974

I am just starting out with this camera. After looking over your code, I assume you are using pins 2 and 4 for data and clock for the IO pins on the camera. Am I correct that pin 8 appears to generate a 10mhz XCLK signal for the module? Also, does this sketch simply initialize the camera and it's registers or does it handle the D0 thru D7 parallel data pins as well?

@TekuConcept

It works!!
After over 100+hrs of squeezing life out of this camera, today for once, I get an 'InitOV7670 OK'! Next step, raw pixel data... (I also love how clean and easy your code is to follow - arigato)

@lahsen

Hello,
Is there any tutorial witch can help me to make connection Arduino and this camera and their code?.

Thank You very macht...
@GybonSolutions

Hey guys do you have any expample with this library? Otherwise we have to go through all the code.
Thanks

@AkhiSlamet

hello all, can you help me on OV7670 camera interface with Arduino?
Please give me reference this it.
Can give me send my email. slamet.rianto@live.com
thanks you very much

@Near32

Hello everyone,
Has anybody tried to implement the ReadOV7670 function and ReadSCCB ?
I am having issue with the first writing of 0x43 on the SCCB :
https://gist.github.com/Near32/225cdca19ad55c6d8306

The rest of it seems to be working fine...
By the way, thank you very much, I might have not gotten that far without this starting code..

@ComputerNerd

Why bitbang when the hardware i2c works just fine? I have a few examples that you can check out that use the avr's hardware i2c. The code is simpler.

@imranDurrani

Hi,
i want to interface arduino with camera and then want to save the taken picture on SD card. Can anyone help me out in this regards ?

Thanks

@freespace
Owner

Oh boy... I completely forgot about this.

This is NOT MY CODE. I found it on the Internet randomly, and felt it should be backed up somewhere, so I put it here so it doesn't disappear into the memory hole.

I am very happy for those that have managed to get it to work, and I can't help anyone having trouble with it because I don't have one of these modules any more. Sorry!

@Ne0ratek

hello,

I would use your code because i find it good, but i have a electronical problem..
Please can you give me a diagram of the electrical system required.

thanks.
Ne0ratek

@Shagas

What voltages are you guys using on the Arduino? The OV7670 IO voltages are rated at 3V max (uno,nano etc). In my opinion this will only work on a Due Arduino because the avr is just way too slow.

@lashap92

Can you give me a full code about interface between ov7670 and Uno R3 or Mega2560. (and wiring circuit please) Thanks!

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